To solve the equation $f(x) = -1$ using the graph provided, we need to find the value of $x$ where the function $f(x)$ (represented by the blue curve) intersects the line $y = -1$.

Looking at the graph:

1. The curve $f(x)$ (blue) crosses the horizontal line at $y = -1$ at a certain point on the x-axis.
2. From the graph, this intersection appears to occur between $x = 2$ and $x = 4$, closer to $x = 4$.

Thus, the approximate solution to $f(x) = -1$ is $x \approx 3.2$ or slightly higher, but we can round it based on the grid.

Would you like any further details or have any questions?

Here are five additional questions related to this problem:

1. What are the $x$-coordinates where $f(x)$ intersects $g(x)$?
2. What is the maximum value of $f(x)$ and at what $x$-value does it occur?
3. What is the solution to $g(x) = 2$?
4. How many times does the curve $g(x)$ intersect the x-axis, and what are the coordinates?
5. What is the slope of the tangent to the curve $f(x)$ at $x = 0$?

Tip: When solving graph-related problems, carefully observe where the function crosses specific y-values to accurately determine the corresponding x-values.